bredsvold



(No Model.) I 2 Sheets-Sheet 2.

P. A. BREDSVOLD.

ADJUSTABLE STOOL. No. 516,183. v Patented Mar. 13, 1894.

lnirrn TATES PATENT OFFICE.

PAUL A. BREDSVOLD, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO LOUISH. BOURRET, 0F SAME PLACE.

ADJUSTABLE STOOL.

SPECIFICATION forming part of Letters Patent N 0. 516,183, dated March13, 1894.

Application filed August 1'7, 1893- Serial No. 483,316. (No model.)

To aZZ whom it may concern:

Be it known that I, PAUL A. BREDSVOLD, a citizen of the United States,residing at Ohicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Adjustable Stools andChairs, of which the following is a specification.

In a stool or chair characterized by my invention, the seatis supportedupon a centrally arranged verticallyadj ustable standard which is inturn arranged to rise from and drop within a suitable base-support. Thebase support is provided with dogs or latches for engaging and lockingthe standard, and as a means for positively operating the dogs orlatchesI provide for each latch, a latch-operating device which isarranged to be raised and lowered with the standard so that regardlessof the height to which the seat may be raised it can be convenientlyreached and operated. The latch-operating devices each consist of a rodlink-connected at both ends with the seat supporting standard and havinga sliding connection with one of the latches, by which arrangement eachrod can have one link arranged below and the other above a guide-bearingwith which the basesupport is provided for the seat-supporting standard,and hence the rods can be raised and lowered with said standard, and atthe same time have a lateral movement when it is desired to operate themfor the purpose of moving the latches. These latch-operating rods areactuated by a litter arranged under the seat and connected with thelatch operating devices by jointed connections, and the latch operatingdevices which have sliding connections with the latches, as aforesaidare attached to the standard by jointed connections, the arrangementbeing such that when the lifter is raised toward the seat, the latchoperating devices will be actuated in a way to release the latches fromthe standard and permit the seat, the standard, the litter, and thelatch operating devices to be raised and lowered as a whole. When thelifter released is allowed to drop independently of the seat andstandard, the latch operating devices Will act to throw the latches inengagement with the standard and thereby lock the same.

Prominent objects of the foregoing are to provide a simple, compact,neat and efficient construction, and to avoid a multiplicity ofoperative parts. Also, to insure the positive locking of the seat at anydesired height, and to permit the seat to be readily locked and unlockedand raised.

In the accompanying drawings-Figure 1 represents in elevation, a stoolembodying my invention. Fig. 2 is a vertical central section through theseat, the standard, and means for locking the standard. Fig. 3 is a viewsimilar to Fig. l but showing a different form of base support. Fig. 4is a cross section through the standard at a pointjust above the lifterso as to show the latter in top plan. Fig. 5 is a cross-section throughthe standard at a point just above the latches so as to show the latterin top plan.

The seat A is shown particularly adapted for a piano stool, but it mayas a matter of course be adapted for a chair and if desired it can insuch case be arranged to tilt upon the standard B in any ordinary orsuitable way. When used as a stool, the seat can be swiveled directlyupon the standard, the swivel shown being formed by a plate 0 secured tothe center of the seat and provided with a socket c to receive the upperend of the standard, which latter is connected with the said plate by apivot D. The standard is provided with notches in and is arranged topass centrally through the top of a base support E which may be of anydesired construction.

In order to properly guide and efiectively steady the standard, thebase-support is provided with a bearing F through which the standard isarranged to work, the said hearing being made of alength sufficient tosteady the standard. The dogs or latches G are supported by thebase-support and are arranged so that they can engage in the notches inthe standard respectively at opposite sides of the latter.

The latch -operating devices comprise a couple of rods H which havesliding connections with the latches and which are connected with thelifter I by jointed connections, such as links K, which connect theupper ends of the rods with the lifter. The rods are also connected withthe standard by jointed connections such as links L arranged to connectthe upper and lower ends of the rods with the standards.

The lifter consists of a plate or ring arranged under the seat andprovided with a central hub or opening for the standard, the preferredarrangement being to extend the neck or socket c of plate 0 within suchhub or opening, in which case the said neck or socket provides a bearingupon which the lifter can slide up and down to an extent suitable foroperating the rods. The lifter can consist of a ring plate of anysuitable construction, it being preferred however for the sake oflightness and appearance to construct it of a ring having a centrallyarranged neck or hub 7L and radial arms 7? to which the links K can beattached.

When it is desired to raisethe seat, the op erator will first raise thelifter which through the medium of links K will raise the rods and in sodoing, the rods will be compelled by the links E to move laterally awayfrom the standard. This movement on the part of the rods in directionsaway from the standard,

causes the latches which are engaged by the rods to move away from andrelease the standard, and thereupon the operator can raise the seat andstandard to the desired height, observing that while so doing the liftershould be kept up to the seat was to keep the latches clear of thestandard. Upon releasing the lifter, it will drop together with the rodsso as to again throw the latches in engagement with the standard, andwhile such action will be induced by gravity, I prefer insuring the sameby a spring M attached to the standard and arranged to engage the rods.By raising the lifter toward the seat, so as to unlock the standard ashereinbefore described, the seat and standard can also be lowered to anydesired extent. The dogs or latches are desirably pivoted to the top ofthe base support as in Fig. 5, although they could obviously be simplysliding dogs or latches. The rods can extend through openings g in thelatches or can have any analogous sliding connection with the same.During the up and down movements of the seat and standard, the

rods slide through the latches which latter f notched at opposite sides,the seat and base are arranged opposite openings in the hub or hearing Fso that when they are moved toward the standard they can work throughsuch openings and engage the standard.

The extent of up and down movement on the part of the seat can bedetermined by the length of rods and standard, it being observed thatthe links L and K are in pairs, one pair, being above and the other pairbelow the bearing F for the standard.

The lifter I is desirably arranged in comparative close proximity to theseat so that in order to raise the latter, the operator while raspingthe seat for such purpose can also take hold of the lifter and draw thesame toward the seat for the purpose of operating the latching device ina way to unlock the standard, and without releasing the seat and.

litter raise and lower the seat to the desired extent. The standardcould be locked by one latch arranged subject to one latch operatingdevice connected with the standard and any suitable lifter by linkssubstantially as set forth, I provide a steadier action by duplicatingsuch means as illustrated.

The latches are desirably arranged and concealed within the base-supportand to such end are covered by a cap-plate N having slots a throughwhich the rods can work.

That I claim as my invention is- 1. The combination of the seat, thebasesupport provided with a latch, the centrally arranged, verticallymovable seat-supporting standard provided with a series of notches andarranged to work through a bearing on the base-support, and a rod,link-connected at each end with the vertically movable stand ard andhaving a sliding connection with the latch, substantially as described.

2. The combination of the seat, the basesupport provided with a latch,the vertically movable seat supporting standard provided with a seriesof notches, and a rod link-connected with the vertically movableseat-support and having a sliding connection with the latch, and alitter I arranged for up and down movement upon the seat supportingstandard independently of the same and link-connected with said rod,substantially as described.

3. The combination of the base-support havin g a centrally arrangedguide-bearing for the seat-supporting standard and provided with a cap Nhaving a slot 01, the seat, the. seatsupporting standard arranged forvertical movement through said guide-bearing,a latch for engagingandreleasingtheseat-supporting standard supported by the base-supportand covered by the cap thereon, and a rodlink-connected with theseat-supporting, standard and having a sliding. connection with thelatch, said rodbeing extended through the slot in the cap, substantiallyas described.

4:. The combination with the seat standard seat and link-connected withthe rods, substantially as described.

PAUL A. BREDSVOLD.

\Vitnesses:

W. D. MIDDLETON, CHAS. G. PAGE.

